Add to My Calendar Print Share Add This Event To Calendar Don't forget about this event. Add it to your calendar. Add to Google Calendar Add to iCal Share This Event Let your friends know about this event! Share it on social media. facebook twitter email Program Type: Science/Tech Age: Tweens Allowed Ages: 8 to 12 Registration for this event has closed. Tweens, ages 8-12, design and engineer a zipline that will send a mystery object descending to the bottom in four seconds. You can only build with the supplied materials.